Abstract: The present disclosure provides a method for producing an improved target organism, the method including: a step A) of selecting an individual exhibiting the improvement from candidate microorganisms of an organism species to which a derived individual different from the target individual belongs; a step B) of obtaining, in a derived individual exhibiting the improvement, an exogenous microorganism involved in the improvement or a part thereof from a gastrointestinal bacterial flora of the derived individual; a step C) of introducing the exogenous microorganism or a part thereof into the target individual; and a step D) of optionally confirming the properties of the gastrointestinal bacterial flora in the target individual, and confirming that a desired improvement is achieved.

Abstract: A flexible boot having a bellows and mount portions on both axial ends of the bellows portion at which the boot is mounted on parts of a mechanism such as an automotive constant velocity joint. The flexible boot has an anti-degradation agent make-up element made of a material which contains an anti-degradation agent and which is capable of allowing the anti-degradation agent to precipitate on the surface thereof. The anti-degradation agent make-up element is fitted on at least a portion of the outer surface of the bellows so that the anti-degradation agent precipitated on the surface of the material of the anti-degradation agent make-up element is caused to progressively immigrate into the material of the bellows thereby making-up the anti-degradation agent in the bellows.